A Summary of Progress in Petrography. in 1887-1896 |
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... possess a specific gravity greater than 3 , a refractive index equal to that of garnet or spinel , and show , before the spectroscope , the lines of iron , calcium , magnesium , and aluminium . The author calls attention to the ...
... possess a specific gravity greater than 3 , a refractive index equal to that of garnet or spinel , and show , before the spectroscope , the lines of iron , calcium , magnesium , and aluminium . The author calls attention to the ...
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... possesses the form 303. The crystals are distorted so as to assume a rhombo- hedral symmetry . Crystals of gold from California showed a persistence of the hexakisoctahedron 180 % . THE BROOKITES 3 from Magnet Cove are divided for the ...
... possesses the form 303. The crystals are distorted so as to assume a rhombo- hedral symmetry . Crystals of gold from California showed a persistence of the hexakisoctahedron 180 % . THE BROOKITES 3 from Magnet Cove are divided for the ...
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... possessing all the essential characteristics of ordinary basalts , with the addition besides of numerous grains of quartz , many of which are surrounded by a zone of glass and pyroxene . From the fact that quartz is also found in bombs ...
... possessing all the essential characteristics of ordinary basalts , with the addition besides of numerous grains of quartz , many of which are surrounded by a zone of glass and pyroxene . From the fact that quartz is also found in bombs ...
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... possessed of several fine speci- mens of the tubular varieties formed by lightning striking in loose sand , Mr ... possess the same composition as the sand in which it formed . Had it exercised such power one would naturally expect ...
... possessed of several fine speci- mens of the tubular varieties formed by lightning striking in loose sand , Mr ... possess the same composition as the sand in which it formed . Had it exercised such power one would naturally expect ...
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... possess a great sim- ilarity of habit to those from the Ilmengebirge , Urals . The phenacite from the Pike's Peak region ( as well as the amazon stone and smoky quartz from the same locality ) is found in pockets in the neighborhood of ...
... possess a great sim- ilarity of habit to those from the Ilmengebirge , Urals . The phenacite from the Pike's Peak region ( as well as the amazon stone and smoky quartz from the same locality ) is found in pockets in the neighborhood of ...
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Common terms and phrases
acid alteration Amer American Naturalist analysis yielded andesites apatite augite axial ratio basalts calcite calcium carbonate cent chemical cleavage clinopinacoid composition compounds Comptes Rendus constituents contains corresponding County crystallographic described diabase diallage diopside Edited by Dr eral examined Fe,O feldspar forms formula garnet Geol Geological glass glaucophane gneisses grains granite ground-mass H₂O hemimorphic heulandite hexagonal hornblende inclusions intergrown isomorphous Jour K₂O Kryst Madison magma magnesium magnetite manganese meteoric iron meteorites Mexico mica microscope MINERALOGY AND PETROGRAPHY Mitth mixture monoclinic Na,O Na₂O Neues Jahrb norites olivine origin orthoclase orthorhombic parallel Penfield Petrog PETROGRAPHY plagioclase pleochroic porphyritic porphyritic crystals possess potassium prismatic Professor Genth pseudomorphs pyroxene quartz recently refractive regard result rocks rutile Schefferite schists serpentine silicates SiO2 sodium specific gravity specimens structure substance supposed tion topaz tourmaline twinning plane variety W. S. BAYLEY xxxii Zeits